Get ready, Sin City ... Dana White tells TMZ Sports he's planning to bro down with Tom Brady way more in Vegas now that the former NFL star is in line to be part-owner of the Raiders!!!
The UFC honcho sounded thrilled at the idea of it all, too ... saying he'll even pick up the checks when the two pal around at dinners!!
Of course, Brady is not quite a Raiders boss just yet ... while he and Mark Davis have agreed to a deal for minority ownership in the NFL franchise, the league still requires at least 24 of its other owners to give their stamp of approval before it's all greenlit.